Well just tuned my 23 2.7l and I guess I was lucky with no issues so far. I was told by ford performance rep that there really is not much likelihood they would make any changes with updates to the tuner. He sounded like he deals with these pretty often and mentioned that as far as updates too...
I don't recall the post but on the [banned site] forum a member had a similar concern. I think they placed a large cup under the exhaust tip and ran the truck for a good while till they collected enough to analyze. This was a older truck but it seemed to work for them to confirm it was coolant...